But is there any possible plugin or future update which will provide access password function?

I'm not sure esactly what you mean in your question, but PasteSerial plugin can handle pasting serial numbers, passwords, etc. Crypt pugin can encrypt/decrypt a file (containing your passwords - for security) and access to both can be somewhat "automated" using the ToolBar, ContextMenu or Hotkeys plugins. If this is not enough for what you want, the Scripts plugin can handle it I'm sure, but some Windows script programming is required. Plugins Manual provides details of all plugins mentioned.